楼梯对框架结构抗震性能的影响

Effect of stairs on seismic performance of frame structure

通过对无楼梯和有楼梯框架结构进行地震反应分析,研究了楼梯对框架结构整体抗震性能的影响,分析了楼梯构件、楼梯间及周围构件的受力性能,结果表明楼梯的设置将增大结构的抗侧刚度,减小结构的自振周期,使结构的楼层剪力和层间位移有一定程度的增大;当楼梯与整体结构共同工作时,楼梯构件不仅内力显著增大,而且受力状态复杂,楼梯间框架柱和框架梁的内力显著增大,而楼梯间周围框架柱和框架梁的内力有所减小,从而易造成楼梯和楼梯间构件产生不同程度的破坏。因而,应采取措施减小楼梯对主体结构的影响,并减轻楼梯构件的破坏。

The seismic performances of the frame structures with and without the stairs were analyzed,the effect of the stairs on the seismic performance of the frame structure was studied,the mechanical properties of the components of the stairs and the stairwell were analyzed.The results show that the setting-up of stairs will increase the lateral stiffness and reduce the vibration period of the structure,increase the shearing force and the inter-story drift of the structure.As the stairs and the structure working together,the internal force of the stairs significantly increase and the stress state is complex,the internal force of the columns and beams of the stairwell significantly increases,but the force of the columns and beams surrounding the stairwell reduces,so that the components of the stairs and stairwell will be destroyed easily.Therefore,the measures should be taken to reduce the effect of the stairs on the main structure,and relieve the damage to the components of the stairs.